Electric Fuel Pump on a Carbureted 350

[veinbar]

I am running a rebuilt '89 chevy 350ci block, "906" vortec cylinder heads, and an aluminum intake with 750cfm Q-Jet retrofitted into a 1976 G10 Sportvan. This is the first vehicle I have ever owned without a mechanical fuel pump so I'm a little lost. I hastily bought a cheap electic fuel pump that pumped at 4psi, and it worked well, but only for about three gallons. It went out, and I replaced it with a fuel pump that can pump up to 9psi. Between 5-9psi. The guys at O'Reily's suggested it. I installed it yesterday, and my van is constantly stalling or sputtering.

My idea is to take the pump I have now, and replace it with a lower psi pump, because I'd hate to buy a $40 dollar regulator, which is almost the cost of the pump itself.

Any knowledge you can throw my way on the issue would be much appreciated. Thank you.